The 4xx codes or client errors indicate that the request contains bad syntax or cannot be fulfilled in this server. They are described in the following table:
|
Code |
Event name |
Reason |
|
400 |
Bad request |
The request couldn't be processed due to syntax error. |
|
401 |
Unauthorized |
The request that was received requires user authentication. Usually the client will ask the user for it. |
|
402 |
Payment required |
This is reserved for future use. |
|
403 |
Forbidden |
The server has understood the request, but is refusing to perform it. The client should not try it again. |
|
404 |
Not found |
The server notifies the client that the user does not exist in the domain specified in the Request URI. |
|
405 ... |
